Rotary pump



N. G. BECKWITH ROTARY, PUMP Original Filed De. 30 1919 HNVENUM Meclwzh Patented qlune d, wget,

Uldllllllll STE@ NURMAN GILES BECKH, OF HAMPTON, ENGLAND, ASSIGNOR F ONE-T T" iin-eater naar raten WALTM, PELIVIORE, OF HASLEMERE, SURREY CUNTY, ENGLAND, AND ONE-[YHRD TO WALTER M NONES, OF LONG ISLAND CETY, Y0.

ROTARY PUMP.

Application led December 30, 1919, Serial No. 348,373. Renewed June t0, 1922. Serial No. 572,028.

To all whom it may concern:

Be it known that ll, NORMAN Gines BECK- wrrnr, a. subject of the King of Great Britain and lreland, and residing at Sheen Cottage,

Hampton, inthe county of Middlesex. England, have invented certain new and useful Improvements in and Connected with Rotary Pumps, of which the following is a specification.

V rllhis invention relates to rotary pumps and has for its object to devise an improved form of pump of this nature which will be simple and cheap to manufacture, efficient in operation and of a form such that l5 the wear of the working parts will be reI duced to a minimum.

The invention consists in a rotary pump 'comprising a casing having inlet and outlet oriices, a rotor eccentrically mounted 2@ within saidcasing and means for separating the inlet and outlet sides of the pump.

The invention also consists in other details and arrangements hereinafter described or indicated.

The accompanying drawings illustrate one convenient form of pump constructed and arranged in accordance with the invention.

Figure l is a sectional elevation, while Figure 2 is a perspective View on a somewhat larger scale illustrating a detail.

ln carrying my invention into ei'ect in one convenient manner, ll form my pump with a substantially cylindrical casing or chamber a mounted if necessary or desirL able or a suitable foundation and provided With inlet and outlet passages respectively indicated at c, (i. Within the pump casing l arrange an eccentric e on which is loosely mounted a. disc or rotary piston f so that upon rotation of the eccentric the piston rolls around the inside of the casing a. lin order to reduce the wear, the piston ispreferably provided with a rubber or other resilient tire or tread g. While its outer surface vmay be provided with water sealing grooves it, and co-operating with the piston to separate the suction and delivery sides of the pump is a valve which is conveniently located within a recess formed in the pump casing. .The valve may be controlled by means of a spring 7c.

ln order to guard against excessive pressures within the pump l may provide a check or relief valve Z arranged slidably within a chamber m forming part of or secured to the pumpcasing and controlled by adjustable springs n, o. `The chamber m is provided with depressions p which are arranged on opposite sides of a valve seat g. The valve Z has a central imperforate web portion r and laterally extending arms e. The arrangement is ksuch that upon an undue rise of pressure on either side of the valve Z the valve will be forced from its seat over towards the other side by such pressure and the suction and delivery sides of the pump are short-circuited and a bypass established which relieves the pressure.

By means of my invention l have provided. a very compact form of pump which is capable of reachin a high efficiency and which is very little liable to wear while at the same4 time the operation and life of the pump will not be materially adac-ted by the entry of sand, grit or other foreign matter which is usually so detrimental to the action vof pumps as hitherto construcd.

'Having now described my invention,

what l claim as new and desire to secure by Letters Patent is A rotary pump comprising a casing having inlet and outlet passages, a ump chamber, a valve and rotary piston c amber communicating with and arranged between said passages having a valve seat and depressions on both sides of said seat, a relief slide valve in said chamber comprising an imperforate central webportion and laterally extending arms, said web portion normally co-acting with said seat to prevent fluid passing from one side of the piston to the other but slidable by abnormal pressure to either side thereof to bring said depressions and spaces between'said arms into register and allow duid to pass'from one side of the piston to the other.

2. A rotary pump of the kind defined in claim l having its piston circumference covered with elastic material and its ends provided with water sealing grooves there- 1n.

3. A rotary pump of the kind defined by claim 1 in which the relief valve is provided with two coiled springs seated between the oppositely extended arms and bearing against its opposite sides for holding the same normally in closed position",`

4;. A rotary pump comprising a casing having inlet and outlet passages, a pump chamber with which the passages communicate, a rotary piston mounted in the chamber and a valve cooperating therewith, a relief valve chamber having its ends communicating with said passages and providedl with an intermediate valve seat, a relief slide valve in said valve chamber pro-- vided with an imperforate portion designed to cooperate with said seat to close communication between the opposite end portions of said valve chamber, said relief valve being slidable by abnormal pressure on either side thereof to displace the relief valve on its seat and permit communication between the opposite end portions of the valve chamber, and resilient means .located in the valve chamber and bearing on the opposite sides of said relief valve for normally maintaining the same in position on said seat.

5. A rotary pump comprising a, casing having an interior circular wall, a rotary piston therein having a circular periphery, said rotary piston being arrangedy eccentrically with the circular wall of the casing and contacting with one side of.the casing, a yieldable abutment diametrically opposite to the contacting side, an inlet, an outlet, channels communicatingwith the space between the rotary piston and the casing and with the inlet and outlet, said channels being at right angles to the direction of movement of fluid in the inlet and outlet, a valve chamber, a valve arranged in the valve chamber intermediate its ends and having both of its sides in communication with the said channels, and resilient means bearing against opposite sides of said Valve adapted to normally hold said valve in closed position under balanced opposite lateral pressures and normally closing inter-communication between the said channels and adapted when shifted by unequal pressure against one of the sides of said valve to establish inter-communication between the channels.

6. A rotary pump comprising a casing having inlet and outlet ports, a pump chamber, a rotary piston in the chamber having an elastic circumferential portion and water sealing grooves in its ends, a valve chamber communicating with and arranged between said ports and having a valve seat and depressions on both sides of said seat, a relief slide valve in said chamber comprising an imperforate central web portion and laterally extending arms, said web portion normally co-acting with said seat to prevent fluid passing from one side of the piston to the other but slidable by abnormal pressure to either side thereof to bring said depressions and spaces between said arms into register and allow fluid to pass from one side of the piston to the other.

7. A rotary pump comprising a casing having inlet and. outlet ports and a pump.

chamber, a rotary piston in the chamber, a valve chamber in the casing communicating with and arranged between said ports and having a valve seat and depressions on both sides of said seat, a relief slide valve in said chamber comprising an imperforate central web portion and laterally extending arms, coil springs arranged in the valve chamber at opposite sides of the valve for normally holding said web portions on said seat to preventfiuid assing from one side of the piston to the otliier side, said valve being slidable by abnormal pressure to either side thereof to bring said depressions and spaces between said arms into register and allow fluid to pass from one side of the piston to the other.

NORMAN GILES BECKWITH. 

